Paraquat is the more lethal pesticide. Symptoms may not necessarily appear immediately after taking it, but may start to appear only after a few minutes or a few days. When paraquat poisoning occurs, it will be harmful to all systems of the body, as follows: 1. Respiratory system: The lung is the main damage organ, at which time symptoms such as chest tightness and shortness of breath may appear, or progressive breathing difficulties may occur. Severe cases can quickly appear within 1-3 days, such as pulmonary edema or pneumonia, or even acute respiratory distress syndrome; 2, digestive system: oropharyngeal and esophageal burns are more common, this can appear nausea, vomiting, abdominal pain, and even vomiting blood, blood in the stool, individual patients will appear esophageal mucosal surface exfoliation; liver damage is mainly manifested as elevated transaminases and jaundice; 3, urinary system: manifested as The damage to kidney function can occur earlier than lung injury, and proteinuria, creatinine and urea nitrogen can appear in a few hours after poisoning, and acute renal failure can occur in serious cases; 4, damage to the heart, mainly manifested as chest tightness and panic; 5, damage to the central system can be manifested as impaired consciousness.